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Postfix

Postfix and ClamAV Milter Gotchas! How to Fix them and Keep your sanity.

Well, it would seem that ClamAV has a wonderful Milter feature.  How good is it?  Exceptionally good.  How much of a pain in the ass is it?  Well, If you have to ask, you haven’t installed it. Here are some gotchas and how to solve them. SSN Heuristics:  This is very Valuable, but leads to(…)

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Using Fail2Ban and Postfix to combat SPAM effectively.

SPAM.. Ugh.  The bain of all our existence.  I just thought I’d share my recipe to combating spam on my server(s) anyway.  It’s an incredibly potent option and you’ll almost see an immediate decrease in spam on your network. I use Postfix, SpamAssassin, and Fail2Ban. So here’s how to do it. The first thing you’re(…)

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The new Email Paradigm and Larger Attachments in Postfix [How-To]

Years ago when broadbrand wasn’t as prevelant as it is today, when people couldn’t and didn’t have the network connectivity and / or disk space to accomodate larger attachments, a superficial universally (although unspoken of standard) of 20 MB was imposed on many mailservers.  This seemed to be a great balance between bandwidth constraints and(…)

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Setting Sendmail and Postfix for relaying from a host on an alternate port – Solution

It happens every once in a while where we need to set up a mail relay on a separate host and port. So here’s the easy solution for sendmail to postfix.  Assuming Sendmail is on your machine where you need to send mail to and Postfix is your real mail server, here’s how to do(…)

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Postfix and Mysql not recognizing forwarding emails [Solved]

If you’ve built a Postfix / Mysql system that doesn’t recognize email forwarding, or just clearly isn’t working, there’s a really simple fix. Look in your main.cf file.  (Usually located in /etc/postfix) you’ll see a line that looks like this: receive_override_options = no_address_mappings Simply comment it out and your forwarding should automatically start work.  Apparently(…)

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Using Filters in Postfix with SpamAssassin to be more effective

It would seem that today, SpamAssassin has become a driving force in Spam Detection.  There are definitely a few tips that can make your spam filtering much more effective.  The first thing to know is this will NOT work if you are using Amavis as it handles Spamassassin directly and doesn’t give you the fine-grained(…)

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